<template>
  <!-- 页面初始化加载数据的动画组件 -->
  <div class="loading_container">
    <div class="load_img" :style="{backgroundPositionY: -(positionY%7)*2.5 + 'rem'}"></div>
    <svg class="load_ellipse" xmlns="http://www.w3.org/2000/svg" version="1.1">
      <ellipse cx="26" cy="10" ry="10" style="fill:#ddd;stroke:none;"></ellipse>
    </svg>
  </div>
</template>

<script>
export default {
  name: 'LoaDing',
  data () {
    return {
      positionY: 0,
      timer: null
    }
  },
  mounted() {
    this.timer = setInterval(() => {
      this.positionY ++ 
    }, 300)
  },
  beforeDestroy() {
    clearInterval(this.timer)
  }
}
</script>

<style lang="scss" scoped>
  @import '../../style/mixin.scss';
  @keyframes load{
    0% {transform: translateY(0px);}
    50% {transform: translateY(-50%);}
    100% {transform: translateY(0px);}
  }
  @keyframes ellipse{
    0% {transform: scale(1);}
    50% {transform: scale(0.3);}
    100% {transform: scale(1);}
  }
  .loading_container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    @include wh(2.5rem, 2.5rem)
  }
  .load_img {
    @include wh(100%, 100%);
    background-size: 2.5rem;
    background: url(../../images/icon_loading.png) no-repeat 0 0;
    transform: translateY(0px);
    animation: load 0.6s infinite ease-in-out;
    position: relative;
    z-index: 11;
  }
  .load_ellipse {
    position:absolute;
    @include wh(2.6rem, 2rem);
    top: 2.2rem;
    left: 0.2rem;
    z-index: 10;
    animation: ellipse 0.6s infinite ease-in-out
  }
</style>